(For this question use annex 033-010 rev. 05.11.2004 or Flight Planning Manual MRJT 1 Figure 4.5.3.1).
Given:
Twin jet aeroplane FL330 Long range cruise
Outside air temperature : -63° C
Gross mass: 50500 kg
Find: True airspeed (TAS)
Find Gross Mass 50500 kg.
It sits between 50000 and 51000 kg.
However the TAS 433 is the same for both so no interpretation is required.
The question gives ISA at FL330 as -50.4°c
However the actual OAT = - 63°c
We must correct for ISA deviation
ISA Deviation = -12.6°c
Read on bottom “Decrease TAS 1 knot per 1°c below ISA”
So 433 - 12.6 = 420.4 kts.
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